Isotopes of cesium found in sea water and in the air Pacific

Radiation situation in the Far East of Russia after the explosion at the nuclear power plant in JapanRussian scientists have discovered isotopes of cesium in sea water and air to the Pacific Ocean about 400 kilometers from the nuclear power plant emergency, "Fukushima-1", said Tuesday the chief of department of ecology of the Far Eastern Regional Hydrometeorological Research Institute (DVNIGMI) Hydromet Alexander Sevastyanov.
The main task of the Russian Geographic Society expedition on the research vessel "Pavel Gordienko" Hydromet is finding radiation in water and air, the Sea of Japan and the Kuril-Kamchatka region of the Pacific Ocean. The first stage of the expedition will last until May 20, the second — to begin in August or September 2011. The route goes from Vladivostok on the Sea of Japan, between the Japanese islands of Hokkaido and Honshu by the Tsugaru Strait, and further along the Kuril Islands to Kamchatka.
"The content of cesium-137 and cesium-134 in the surface layer of sea water, and at a depth of 50 meters is about 20 becquerels per cubic meter. At 100 meters the level drops to 6 becquerels per cubic meter, at depths of 150 and 250 meters of man-made radionuclides are not found ", — said the head of flight Sevastyanov.
According to the Russian radiation safety standards for drinking water (sea water is not specified), the level of cesium-137 should be below 11 000 becquerels per cubic meter of cesium-134 — 7.2 thousand becquerels per cubic meter.
They also found in the air radionuclides iodine-131 and cesium-134 and 137 from the emissions from the emergency plant. "This is a small value, thousands of times less than the permissible activity in the air for the people," — said the official.
First on the Kuroshio
Meanwhile, Russian scientists were the first to measure the level of radiation on the northern border of Kuroshio Current, which carries warm water from the tropics by Japan and then goes into the North Pacific current bound for North America. According to scientists, due to this current isotopes are far from the Russian coast.
"We were the first in the area of the ocean to measure radiation levels. While it is difficult to say for sure whether we have groped traces drain radioactive water from nuclear power plants, or the remnants of deposition from the air, but we are inclined to the first version," — says chief of department of ecology DVNIGMI Roshydromet Sevastyanov.
To determine the levels of cesium, for 12 hours at the station sampling scientists pumped about two thousand liters of sea water through the sorbent, which is sensitive to Cs, and then measured it in a gamma spectrometer.
More detailed analysis of the content in the water of strontium-90 and plutonium and tritium will be made after the end of the expedition.
Grant of the Russian Geographical Society on an expedition to assess the impact of natural and man-made disaster in Japan was awarded on April 15 Far Eastern Regional Hydrometeorological Research Institute (DVNIGMI) Hydromet, which owns the ship "Pavel Gordienko."
Fast and detailed assessment of the radiation situation is due to the interaction of scientists on board the ship "Typhoon" Hydromet, the Radium Institute of the VG Khlopin (Rosatom) Gosakvaspasa MOE, Research Institute of Radiation Hygiene after PV Ramzaev (CPS), and meteorologists and hydrologists DVNIGMI Hydromet.
Serious study of the ecosystem, fish and marine organisms will be held during the second phase of the expedition. He is expected to begin in August or September at the training vessel "Professor Clustine", which is currently being prepared for repairs in the port of Vladivostok.
After the devastating earthquake in Japan on March 11 and the ensuing tsunami on nuclear power plant "Fukushima-1" was recorded a series of accidents caused by the failure of the cooling system. As a result of incidents at the plant revealed several radiation leaks, forcing authorities to evacuate people from the 20-kilometer zone around the plant.
She later appeared information about the discovery in a number of areas of Japan radioactive elements, including isotopes of iodine and cesium in the air, sea and drinking water as well as in products.

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